Uwatec recently replaced their long serving bottom timer with the new 330m model. It has some improvements on the old model with a clearer screen, an ascent rate in metres and a dive timer that runs to 99hours amd 59minutes. The previous model could not exceed 99minutes or dive beyond 99m.
I really like the simplicity of the bottom timer- it just gives the information you need on a clear display. The screen is clear, but easy to scratch and best protected by some clear film, such as that used to protect pda screens. The depth, time (no seconds) and max depth are all very clear and the lower right display cycles through average depth and temperature. The average depth is the mean taken from the surface and reads shallow when compared with an Aladin tec G2 reset at the bottom of the shot. Its not a huge problem but divers using average depth for their decompression planning need to appreciate that the reading will not be the true average depth. The ascent rate in metres per minute is quite useful and easy to read. Not having a backlight causes little problem as the screen is easy to read in torchlight, due to the high contrast of the digits.
When combined with a niknaks mounting and two bungee loops the bottom timer is secure and reliably stays in place. I have experienced no problems with this model and really do appreciate its clarity. It would be nice to have an average depth feature that you could reset but this would require a complete redesign of this trustworth unit.
If your looking at following a run time schedule as a primary method of diving then this timer would make an excellent addition to your diving equipment. It also makes an excellent back up in the event of primary computer failure.